Loud-speaker horn



NOV. 26, 1929. Q H WATERSv 1,737,102

LOUD SPEAKER HORN Filed May 26, 1927 aL-*lv l "f Yea Patented Nov. 26, 1929 UNITED STATES PATENT OFFICE LOUD-SPEAKER HORN Application filed May 26,

My invention aims to provide a new and improved horn for radio loud speakers, f such construction that it will effectively transmit the ent-ire range of audible frequencies from the lowest (25 per second) to the highest (4,096), and will fill unusually large auditoriums, without any distortion of the sound. In carrying out this object, the horn must be of at least seventeen feet in length,

and a further object of the invention is to provide a novel construction whereby this unusual length is formed by separate reaches extending in differentdirections and in such a manner that the horn willbe compact and 1,5 hence may be confined in a comparatively small cabinet, the space occupied by the horn, being approximately fifty-four inches high, thirty inches wide and twenty-one and onehalf inches from front to rear.

IVith the foregoing in view, the invention resides in the novel subject matter herein* after described and claimed, the description being supplemented by the accompanying drawing.

Fig. 1 is a perspective view looking toward the front and one side of the horn and showing the speaker unit attached thereto.

Fig. 2 is a perspective view looking toward the rear of the horn.

Fig. 3 is a diagram showing the preferred diameters of the horn at different distances from its smaller end and also giving certain other preferred dimensions.

rIhe horn is preferably of square cross section and it increases in size toward one end,

being provided at said end with a bell 5 which opens horizontally. Behind this bell, the horn embodies a reach 6 extending downwardly, and a second reach 7 curves laterally and upwardly from the lower end of said reach 6. A third reach 8 extends upwardly from the reach 7 at one side of the first reach 6, and a fourth reach 9 extends laterally from the upper end of said reach 8 over the reach 6. From this fourth reach 9, a fifth reach 10 extends downwardly at the side of the reach 6 remote from the third reach 8. A sixth reach 11 curves forwardly and upwardly from the lower end of the fifth reach 10, and a seventh reach 12 extends upwardly 1927. seriai N.`194,4s7.

from the front end of said sixth reach 11, said seventh reach 12 being interposed between the bell 5 and the fifth reach 10. At any desired location between the reaches, spacers 13 may be secured, and it will be understood 55 that any desired provision 14; may be made for attaching a speakerv unit 15 to the upper end of the reach 12. Moreover, while I have herein used such expressions as horizontally, upwardly, downwardlyf front,7 60 rear, etc., and intend that the speaker horn shall be positioned'as shown in Figs. 1 and 2,

it will be understood that such terms are relative rather than limiting, and that in some instances, the horn might be otherwise positioned.

After numerous experiments, I have found that ahorn constructed from thin wood, substantially seventeen feet in length, gives the best results, when its cross-sectional size varies substantially as indicated in Fig. 3. From this view, it will be seen that the small end of the horn has a diameter of one-half inch, that one foot from this small end the diameter is five-eighths of an inch, that said diameter is three-fourths of an inch two feet from the smail end, one inch three feet from said small end, one and one-fourth inches four feet one inch from said small end, etc. This general proportion, has been found to eifectively cover the entire musical scale with the same clearness and volume, and it carries reproductions of the human voice from the lowest to the highest, in a life-like manner without distortion. On account of these advantages, $5 obtained only after repeated experimentations with horns of other lengths and having their diameters varied in different ways, I consider the substantial proportions herein disposed, to constitute an important part of my invention. Also, the manner in which I distribute the length of the horn in different reaches so as to produce a compact structure, is also considered of importance.

I claim A horn enlarged toward one end, having a bell at said end and having substantially the proportions given by the following dimensions length seventeen feet, diameter at small end, one-half inch; one foot from small end,

y*ses {ive-eighths inch; two feet from small end, three-fourths inch; three feet from small end, one inch; four feet and one inch from small end7 one and one-fourth inches; five feet and two inches from small end, one and fiveeighths inches; six feet and three inches from small end, two and one-eighth inches; seven feet and four inches from small end, two and ve-eighths inches; eight feet and ive inches from small end, three and one-half inches; nine lfeet and six inches from small end7 four and ive-eighths inches; ten feet and seven inches from small end, six and one-half inches; eleven feet and eight inches from small encl, eight and iive-eighths inches; twelve feet and nine inches from small enel, eleven and three-eighths inches; thirteen feet and ten inches from small end, fifteen and one-fourth inches. A

In testimony whereof I have hereunto ai'- iXed my signature.

GABE H. WATERS. 

